Ms Gundersen-Reid expected a large portion of the visas were temporary.
"We have a lot of seasonal work with our vineyards and orchards. I know a few that just use locals, as they have for many years, but a lot of bigger vineyards use contracting companies who tend to bring in people. It would be quite difficult to just use locals."
Migrants also filled skill gaps.
"We have areas where we struggle to get people into skilled jobs," Ms Gundersen-Reid said.
"We're currently working with various organisations to work out exactly what those skill gaps are but, off the top of my head, it can be hard to get diesel mechanics, top-level engineers and environmental specialists. We're also always in need of good doctors."
Nationally, more than 860,000 people have had work visa applications approved since July 2010. In that time, 53,123 visa applications were declined.
Tour guides gained the most visas, followed by chefs and dairy cattle farmers. Cafe or restaurant managers, retail managers and retail supervisors were the next most common.
Occupations with only one visa approved included telephone betting clerk, postal sorting officer, mothercraft nurse, exercise physiologist and clay products machine operator.
Meanwhile, the only applicants to have their visas declined listed their occupations as "vending machine attendant" and "weighbridge operator".
Under the Immigration Act 2009, visas can be refused if an applicant has been sentenced to imprisonment, been previously deported from any country or involved in known criminal or terrorist groups.
Visas can also be declined if an application isn't complete, if an immigration officer believes information is not genuine, if the applicant's purpose is not genuine or if they do not intend to abide by the visa conditions.
Applicants who are not lawfully in New Zealand when they apply or who don't meet standards of "good health and good character" may also be declined.